I’ve just published a new page on the Citizen’s electro-mechanical line of watches made between 1966 and about 1975. For me they are a fascinating bit of watch history, a technology developed just before, and therefore rendered very quickly obsolete by the quartz ‘revolution’.
And there are a couple of world firsts in there 🙂
Quick link: https://sweep-hand.org/the-x8-cosmotron/
As I say right at the bottom of the new page, please let me know if you can add information, or see any errors.